Automatic calling device



Dec. 7 1926.

' J. G. BLESSING AUTOMATIC CALLING DEVICE Original Filed Jan. 14, 1921 Patented Dec. 7, 1926.

irsn STATES PATENT OFFICE.

JOHN G. BLESSING, OF OAK FOREST, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

AUTOMATIC ELECTRIC INC, OF CHICAGO, ILLINOIS, A

CORPORATION OF DELAWARE.

AUTOMATIC CALLING DEVICE.

My invention relates in general to an automatic calling device and more specifically to an improved type of impulse transmitter for use'in an automatic telephone system of the standard two wire type in which the automatic switches are operated by impulses of current resultant upon the opening and closing of the series line circuit at the telephone. This calling device may of course be used for various other purposes without departing from the spirit of my invention.

Among the features and objects of my invention are, to provide an improved device for stopping both the dial and the governor and for operating the shuntsprings and to provide various other detailed features of in'iprovement which tend to simplify the construction and to improve the operation and general eliiciency of the device in a manner which will be hereinafter pointed out.

This application is a division of my copending application, Serial No. 487,283, filed January 14, 1921.

Fig. 1 of the drawings shows a front view of the calling device with the cap covering the clock spring, removed.

Fig. 2 shows a side view right of Fig. 1.

Fig. 3 shows a back view of the device showing the governing device and the. cam and springs controlled by the dial.

Fig. 4 shows a rear view of the finger hole dial showing the gear and ratchet device attached thereto.

Fig. 5 shows a front view of the device with the finger hole dial and number plate removed to show the various co-operating gears and other operating elements.

Fig. 6 shows a detailed view of the governing device.

Fig. 7 shows a taken from the right of taken from the side view or" the governor Fig. 6.

Fig. 8 shows the cap which fits over the spring cup on the face of the finger hole dial.

Fig.9 shows a detail of the gear 21. Figure 10 is an enlarged detailed View of the bracnet 10, which is partially shown in Fig. 5. Thisview also shows an enlarged view of thecoopel'eting U shaped pin 36.

Figure 11 s an enlarged view of the spring. 27, which is partially shown in Figs. 3 and 5. I V

I w ll no d s ribet ie various we of Divided and this application filed March the calling device more in detail and ex plain the operation of the same, reference being had to the various figures of the drawmg. I

My improved calling device consists of a mounting plate'2 having recessed openings at its front and rear to receive the various elements. On the front of the plate 2 is a stud 3 (Fig. 5) and a protecting ring 4 around the circumference for protecting the finger hole dial 5 which is fastened by means or a screw 6 and lies just inside and flush with the ring 1. A spring cup 7 is securely fastened to the dial and encloses a clock spring 8 one end of which is fastened in a slot in the cup 7 and the other end is slotted and hooked over a projection on one side of the screw 6. The spring 8 normally tends to turn the dial in a counter clockwise direction, the dial being held from rotation further than normal by a screw 9 which projects through the dial and meets a part 10 (Fig. 5). A finger stop 11 is secured to the under side of the plate 2 and projects over the finger dial.

Referring now to Fig. 3 it will be seen that the rear of the plate 2 has a raised shoulder 12 which is circular in form but the outer edge of which is in the form of a circle the center of which is offset from the center of the circle forming the outer edge of the plate 2. The circle forming the inner edge of the shoulder 12 is concentric with the outer edge of the plate 2 so that the shoulder 12 is thicker on one-side than on the other, forming a mounting space for the shunt springs 24 and 2 5 and the interrupter springs 43 (see Fig. 8) and thus also making the distance from the outer edge of the plate 2 greater on one side than on the other. This permits the dial to be mounted in the cut on the telephone base in such .a manner as to permit the dial to be'mounted nearer horizontal.

Loosely mounted on a rigid shaft 13 is a governing device (see Figs. 6 and 7) which consists of a worm gear Wheel l ha thin strip of metal 15,011 which is mounted any suitable braking material 16, another strip of spring material which has been formed out into two spring arms 17 to which are attached' weights 44 and on which is mounted some suitable braking material 18.

' .The' shoe t e er b d pa ts a e m un on a part of the gear 14: which has been threaded, and are held there securely by the nut 19. The governor complete (Figs. 6 and 7) is retained on the shaft 13 by a small spring key 20 which fits into a groove in the shaft 13 (Fig. 2).

Firmly attached to the plate 2 is spring 2?,(Fig. 5) which is cut in a U shape at its detached end so as to partly encircle the shaft 13, and so tensioned as to rest against the gear 1 to force the braking surfaces 16 away from plate 2. The worm gear 14; meshes with the gear 21 which meshes with gear 23. Gear 21 being mounted on the plate 2 in the same manner as the governor assembly. Attached to gear 23 is a shaft which extends through the plate 2 and to which is attached the cam 30.

On the under side of the finger dial 5 (see Fig. 4) is a hub 31 loosely mounted on which is a unit gear and ratchet wheel having ratchet teeth 32 on the side next to the dial and gear teeth 33 underneath. A pawl 34: is secured to the under side of the dial 5 and is held in engagement with ratchet teeth 32 by a spring 35, so that as the dial rotates in one direction the pawl 34 slides over the teeth 32 and the ratchet and gear remain stationary, but as the dial returns it carries the ratchet and gear with it.

When the finger dial is mounted in place on the plate 2 the gear teeth 33 engage with the gear 22, which is a part of the hub of gear 21.

In Fig. 5 is a bracket 10 which has two arms 37 and 38, and a bearing pin 41. This bracket is held in a groove on a projection of plate 2 by the head of screw 40 and the bracket works freely on the bearing pin 41. Screw 39 screws into plate 2 and is used as an adjusting screw to limit the movement of the bracket 10. Arm 37 controls a U or fork shaped pin 36 which projects through the plate 2, one point of this pin 26 (see Fig. 2) comes in contact with a bushing of the shunt spring 24. The 0t 161 point 412 of this U or fork extends through the plate 2 to act as a governor stop to prevent the possibility of more than the predetermined number of revolutions of the governor. The arm 38 engages with the screw'9 in the finger hole plate 5 and through the back tension of spring 8 the screw 9 engages the arm 38 overcoming the tension of the shunt spring 2 thus holding the shunt springs open when the dial is normal.

Upon starting to rotate the dial in a clock wise direction, the screw 9 will immediately disengage from arm 38 and cause the pins 1 2 and 26 to respond to the pressure of the shunt spring 24 and thereby take away the obstruction to the rotation of the governor and close the shunt springs. It will be seen that the dial must come back to normal before the pins are again forced through the plate to stop the governor and again open the shunt springs.

Particular attention is called to the fact that the gears let and 21 are so cut as to have a tendency to draw the governor downward as the dial returns to normal, however, the spring 27 is so tensioned that it overcomes this downward pull upon the normal return of the dial. If, however, attempt is made to force the dial, the tension of spring 27 will be overcome and braking surfaces 16 of the strip of metal 15 will be drawn in to contact with base of plate 2 and serve to prevent an increase in the speed of the dial.

Fig. 9 is a detailed view of the gear teeth of the gear 21. It is to be understood that the teeth of the gears 1 1, 21 and 23 are all cut on the bias or are worm gears, so that the gear 21 in its rotation tends not only to rotate the gear 1 1 but also tends to move the shaft of said gear M endwise.

It will be seen therefore that I have provided a very efficient type of automatic calling device which has a number of new and novel features of improvement and having fully described the details of said improvements and methods of operations what I consider to be new and desire to have protected by Letters Patent will be pointed out in the appended claims. 7

1. In a calling device, a governor and a pair of springs, a force for operating said governor and springs, a movable bracket, a forked pin and means controlled by said force for operating said bracket and forked pin for stopping said governor and chang ing the position of said springs.

2. In a calling device, impulse sending mechanism, a plurality of gears, one of said gears transmitting both vertical and rotary motion to another of said gears. said mechanism controlled by both the vertical and the rotary movement of said last mentioned gear.

3. In a calling device impulse sending mechanism, a plurality of gears, a force for driving said gears, one of said gears trans mitting both vertical and rotary motion to another of said gears, said mechanism controlled by both the vertical and the rotary movement of said last mentioned gear, another force transmitting motion to said last gear in an opposite direction, normally neutralizing the vertical motion produced by said first gear. V

4. In a calling device, a governor. a U- shaped fork, a forcev for operating said fork in one direction to stop said governor and another force for operating said fork to permit the operation of the governor.

5. In a calling device, a governor, a pair of shunt springs, a bracket, a U-shaped fork having prongs, said bracket cont-rolling one prong of said fork to operate said shunt springs in one direction, and forcing another prong of said fork into the path of the governor when the dial is at normal, said shunt springs operating in an opposite direction to move said U-shaped fork into another position during the operating period, to clear the path traveled by said governor.

6. In a calling device, a governor and a pair of shunt springs, a force for operating said governor and shunt springs, a movable bracket, a forked pin and a finger hole dial" having thereon a projection for operating said bracket and forked pin for stopping said governor and changing the position of said springs.

7. In a calling device, a pair of interrupter springs, a cam for operating said interrupter springs, a spur gearing, one of said gears transmitting both vertical and rotary motion to the other gear, said interrupter springs and cam controlled by both the vertical and rotary movement of said other gear.

8. In a calling device, a dial rotatable forward and back, a gear and pinion having the same axes as the dial, a ratchet connection between the dial and gear wheel, a second shaft, a pinion and gear wheel supported on said second shaft, said pinion meshing with said first gear wheel, a cam shaft and a governor shaft, and pinions on said two last mentioned shafts meshing with said second gear wheel.

9. In a calling device, a cup-shaped frame having a cylindrical extension on the back thereof eccentric with the periphery of the cup, said extension having a cylindrical recess therein concentric with the periphery of the cup, and a governor contained in said recess.

10. In a calling device, a dial, a frame for supporting the dial on the front thereof, a cylindrical extension on the back of said frame and eccentric with the dial, said extension having a cylindrical recess concentric with the dial, and a governor mounted in said recess.

11. In a calling-device, a rotatable. governor, a movable member, a force for operating said governor normally maintaining said member in the path of rotation of said governor to prevent its operation, andv another force for moving said member out of the path of the governor.

12. In a calling device of the rotatable dial type, impulse transmitting mechanism, a rotatable governor, and co-axially related shafts supporting said dial and governor respectively.

Signed by me at Chicago, Illinois, this 27th day of February, 1925.

JOHN G. BLESSING. 

